16661307 has 8 divisors (see below), whose sum is σ = 23923984. Its totient is φ = 10253088.

The previous prime is 16661297. The next prime is 16661317. The reversal of 16661307 is 70316661.

It is an interprime number because it is at equal distance from previous prime (16661297) and next prime (16661317).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16661307 - 2⁶ = 16661243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213568 + ... + 213645.

It is an arithmetic number, because the mean of its divisors is an integer number (2990498).

Almost surely, 2^16661307 is an apocalyptic number.

16661307 is a deficient number, since it is larger than the sum of its proper divisors (7262677).

16661307 is a wasteful number, since it uses less digits than its factorization.

16661307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427229.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 16661307 is about 4081.8264294308. The cubic root of 16661307 is about 255.4090934414.

Adding to 16661307 its reverse (70316661), we get a palindrome (86977968).

The spelling of 16661307 in words is "sixteen million, six hundred sixty-one thousand, three hundred seven".